Litecoin partially qualifes based on its high liquidity and different hashing algorithm, but shares basically an identical codebase with bitcoin. Therefore, It fails.
Counterparty uses the bitcoin blockchain so it also fails.
Codebase? Seriously?

... most customers/users could not even differentiate between two codebases. And when does a codebase qualify as beeing sufficiently different, at all? And for what exactly?
That argument ... fails. And what exactly is a "PoW failure"? And why is "nothing at stake" ... "a crippling potential weakness"? Either is is crippling, or it is potential. Cannot have both.